Validation solutions (µg/ml)

50

100

250

Accuracy (% recovery)

Day 1

95.1

95.4

95.6

Day 2

99.1

102.3

102.4

Day 3

99.7

99.6

101.1

Precision (% RSD)

Day 1

2.4

0.5

0.9

Day 2

3.6

2.2

0.2

Day 3

4.8

0.6

0.9

Intermediate

3.9

3.3

3.2